Hydraulic pump and motor equations

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Flow rate
Q = D n / 1000 (1)

where

Q = flow rate (l/min)

D = displacement (cm3/rev)

n = revolutions (rpm)

rev = revolution
rpm = revolution per minute

Shaft Torque
T = D p / 20 π (2)

where

T = torque (Nm)

p = pressure (bar)

Shaft Power
Ps = T n / 9554 (3)

where

Ps = shaft power (kW)

Hydraulic Power
Ph = Q p / 600 (4)

where

Ph = hydraulic power (kW)